Characterization of Combined Sewer Overflows from a Small Urban Watershed and Determination of Optimum Detention Volume

소규모 도시유역 합류식 하수관거 월류수 특성화 및 최적 저류지 용량 결정

  • Jo, Deokjun (Department of Civil Engineering, Dongseo University) ;
  • Kim, Geonha (Department of Civil and Environmental Engineering, Hannam University)
  • 조덕준 (동서대학교 토목공학과) ;
  • 김건하 (한남대학교 토목환경공학과)
  • Received : 2005.10.27
  • Accepted : 2006.02.01
  • Published : 2006.03.30


Diffuse pollution from an urban area contributes to the significant pollution loading to a receiving water body. In this paper, rainfall runoffs from an urban basin with combined sewer systems located in the city of Daejeon were monitored to measure the rainfall runoff discharge rates and pollutant concentrations. Strong first flush effects were observed for all monitored rainfall runoffs. The first flush effects were closely related to rainfall intensity, while suspended solids were closely related to pollutant constituents. The observed averaged Event Mean Concentrations (EMCs) of Combined Sewer Overflows (CSOs) were 536.1 mg SS/L, 467.7 mg CODcr/L, 142.7 mg BOD/L, 16.5 mg TN/L, and 13.5 mg TP/L. Storage volumes for containing the first flush to improve water quality of the receiving stream can be estimated based on suspended solid concentration. In this study, retainment of the first flush equivalent to 5mm of precipitation could reduce diffuse pollution loading induced by CSOs to a receiving water body by up to 80% of suspended solid loading.


Supported by : 수자원


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